Electric incandescent lamp.



H. KIEHL.

ELECTRIC INCANDESCENT L'AMP. APPLICAIION man APR. 5, 1916.

' INVENTOR. HUGO 12251111,,

/ ATTORNEYS.

HUGO KIEHL, OF CHICAGO, ILLINOIS.

ELECTRIC INGANDESGEN'I LAMP.

Specification of Letters Patent. Patented Feb, 27, 1917,

Application filed Apri15, 1916. Serial No. 89,123.

To all whom it may concern:

Be it known that I, HUGO KIEHL, a sub- -ject of the German Empire, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric In-- candescent Lamps; and I do hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawing, forms a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates generally to improvements in electric incandescent lamps, and it consists, essentially, in the novel and peculiar comlunatlon of parts and details of construction, hereinafter first fully set forth and described and then pointed out in the.

claims. I

The object of my present invention is the production of an electric incandescent lamp possessing a very high illuminating capacitywithout materially increasing the cost of manufacture of the same To attain this result, I construct this lamp in a manner clearly shown in the drawings, in which Iiigure 1 .is an elevation of an electric incandescent lamp, constructed in accordance with my invention. Fig. 2 is a diagrammatic view of the filament of this lamp, illustrating the same in a developed plane. Fig.3 is a plan on an enlarged scale showing diagrammatically, the course of the filament. Fig. l is a plan on an enlarged scale, of a multiplicity of intertwined strands or members of said filament. Fig. 5 is a fragmental view of a modified form of construction of the same.

Like parts are designated by the same characters and symbols of references in all the various figures.

In these drawings A, designates the electric incandescent lamp as a whole. It comprises a glass bulb 12, having the usual metalli'c male screw member 13, to afford means for attachment of a standard lamp socket, not shown, which male screw member forms one of the electric conductors, and a contact point 14, forming the other element of said electric conductor. Into this bulb leads the current-conducting element 15, downwardly to near the lower end of, the bulb, and also a pendant member or post 16, which post carries at its lower end radially projecting arms 1i. clear the upper end of said pendant post there are further, radially extendmg. arms 18, all of Wl11(:l 1 said arms are preferably hook-shaped at,their free ex-- tremities, as clearly shown in Fig, 1.

To the aforesaid arms there is hooked the lamp filament, which filament may be of any of the, at present known, electrical conductorsl Assuming that the conductor 15 is the pos ve element of the lead, it turns at-the lowtir' end of the bulb, at a point marked 05 upwardly to a point marked by the numeral 2; it then returns downwardly to a point marked-Z), and then again upwardly to a pomtlmarked 8. This winding is then repeated to the successive points 0, 4, d, 5 and' e, froi which the lead turns upwardlyat 19, and lo twardly and out of the bulb in the usual manner.

This method of stringing or leading the filament, I have, however, discovered does not aifbrd the maximum of light efiiect; and

to increase the same, which is the object of this invention, I proceed, as follows:

Instead of leading the members 20, 21,

Fig. 2, upwardly and'downwardly, as described, .I intertwine or twist these two strands together, and I do so to the next strands 22 and 23; 24 and 25; 2t} and 27, as I ment, and leading the same through the bulb.

either by the presently practised method, or intertwining the adjacent filament strands, as above described, has resulted in a still greater light-giving capacity of the incandescent lamp.

The fragment of a filament shown in Fig.- 4, indicates a strand'comprismg a mult plicity of members intertwined or twisted like a cord or rope; but it is to be understood that this strand is to be trained over the hooks otthe supports in the bulb in all respects the same if the filament were but a single strand.

I now desire to call attention to the'fact that the loops u, b. e, (Z, and e, and 2 3, 1,

and 5, are quite open, and that the intertwining of the strands between the hooks, commences and ends at some distance from these respective hooks, the result being that i Fig. 5, the fragility of the filament excludthe portions of the filament between the loops and where the intertwining begins, glows only with an intensity due to the electric current passing through these portions while the intertwined portions glow with increased intensity. 'Lhe intertwining of the strands is an open Winding, and is best shown in -ing the .possibility of aclse winding or intertwining ojtthese strands.

It s,. of course, evident that. the downwardly pending rod 16, is constructed of a nontilehtricity' conducting material which is not affected by the heating conditions of an electric incandescent lamp, such as glass,

filament, as shown in Fig. 2 pre'sent-diflicul ties in. the intertwining and trainingy'I shall fo'rmthe filament fin sections, "as shown in Fig. 5,; in which 32 indicates one of said strands, and 33 the other of two adjacent strands. These two strands I shall then ing' strands 34, 35, as shown at 36, whereby a continuity of the electric conductor is attained in an efiicient manner. I

Having thus fully described my inven-- unite at their terminals to the next followtion'Iclaim as new, and desire to secureto myself by Letters Patent of the United States z-i 1. In an electric incandescent lamp, fila ment supports in said lamp, a filament, said filamentcomprislnga series of strands, adjacent strands of said series belng 1n contacting relation 'toeach other at a point remote from said supports. I

2. In an electric incandescent lamp, filamnt supports in said lamp, a filament, said filament comprising a series of strands, said strands comprising a multiplicity of mem. bers, adjacent strands being in contacting relationship to: each other at point remote from said. supports.

3. In an electric incandescent lamp, filament supports in said lamp, a filament, said filament compr sing a series of strands, adjacent strands o'f said series being intertwined at a point remote from said supports.

4:. In an electric incandescent lamp, filament supports in said lamp, a filament, said filament being trained in a zigzag up and down manner .over said supports, adjacent members of said filament being in contacting relation to each other at a point remote from said supports.

5. In an electric incandescent lamp, filament supports in said lamp, a filament, said filament being comprised-of a plurality of strands, said strands being intertwined, said strands being trained. in a zigzag manner over said supports, adjacent members 01": said strands being intertwined at a point remote from said supports.

6 An electric incandescent lamp, including, a'trans parent bulb, electric current-carrying leads into and out of said bulb, means in said bulb: for supporting a filament there- .in, saidmeans including a post, aseri'es of upper arms and a" series of lower arms, said arms being hook-formed at their free ends andin current-carrying connection with said leads, and afilament 1n said bulb, said lilament being trained over said hooks with open loops, adjacent strands of said filament being intertwined, the intertwining begin.- ning at some distance from said hooks.

In testimony that I claim the foregoing as my invention, I have hereunto set my hand.

HUGQ KIEHL. 

